Hi, my question is:

Consider the integral of 1/(t(t+1)) with respect to t, from lower limit t=0 to the upper limit t=n, where n is an arbitrary positive integer.

Let P be the partition {1, 2, ..., n}. Find lower and upper estimates L(P) and U(P) for the integral above. Simplify your answer as far as possible.

I know that you need to use Riemann's integral but I'm really stuck on this question, so any help would be greatly appreciated!